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ExtJS 等待两个/多个store加载完再执行操作
Extjs加载Store是异步加载的,这有很多好处。但是当我们要在两个或多个不同的store加载完再执行一些操作时,异步加载就成了一个问题。在Stack Overflow 等网站搜集并试用了几个处理方法,总结如下。
1、自己定义一个组件 (From:http://stackoverflow.com/questions/9379484/extjs-waiting-for-multiple-stores-to-load)
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | Ext.define( ‘Ext.ux.StoreLoadCoordinator‘ , { mixins: { observable: ‘Ext.util.Observable‘ }, resetStoreLoadStates: function() { this .storeLoadStates = {}; Ext.each( this .stores, function(storeId) { this .storeLoadStates[storeId] = false ; }, this ); }, isLoadingComplete: function() { for ( var i=0; i< this .stores.length; i++) { var key = this .stores[i]; if ( this .storeLoadStates[key]== false ) { return false ; } } return true ; }, onStoreLoad: function(store, records, successful, eOpts, storeName) { this .storeLoadStates[store.storeId] = true ; if ( this .isLoadingComplete()== true ) { this .fireEvent( ‘load‘ ); this .resetStoreLoadStates(); } }, constructor: function (config) { this .mixins.observable.constructor.call( this , config); this .resetStoreLoadStates(); Ext.each( this .stores, function(storeId) { var store = Ext.StoreManager.lookup(storeId); store. on ( ‘load‘ , Ext.bind( this .onStoreLoad, this , [storeId], true )); }, this ); this .addEvents( ‘load‘ ); }}); |
使用的时候把两个不同的store,作为参数传过去。
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | var store1 = Ext.create( ‘Ext.data.Store‘ , { storeId: ‘Store1‘ , .... (rest of store config) }}); var store2 = Ext.create( ‘Ext.data.Store‘ , { storeId: ‘Store2‘ , .... (rest of store config) }}); var coordinatior = Ext.create( ‘Ext.ux.StoreLoadCoordinator‘ , { stores: [ ‘Store1‘ , ‘Store2‘ ], listeners: { load: function() { // Do post-load work } } }); |
2、使用setInterval (From:http://blog.csdn.net/littlechang/article/details/8188303)
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | var bChartArr =[ false , false , false , false ]; //加载图表轴 Ext.getStore( "ChartAxes" ).load( { params :{ queryId:queryId }, callback:function(){ bChartArr[0] = true ; } }); //加载图表序列 Ext.getStore( "ChartSeries" ).load( { params :{ queryId:queryId }, callback:function(){ bChartArr[1] = true ; } }); //加载图表样式 Ext.getStore( "ChartStyle" ).load( { params :{ queryId:queryId }, callback:function(){ bChartArr[2] = true ; } }); // 按钮 Ext.getStore( "Buttons" ).load( { params :{query_id:queryId}, scope: this , callback:function(){ bChartArr[3] = true ; } }); var me = this ; // 等待所有的Storoe加载完成后执行 var timer = setInterval(function(){ if (bChartArr[0] && bChartArr[1] && bChartArr[2] && bChartArr[3]){ clearInterval(timer); // 清除等待 // 解析图表样式、轴、序列动态生成图表 me.createChartPanel(); } },100); |
3、与方法二类似 (From: http://stackoverflow.com/questions/9379484/extjs-waiting-for-multiple-stores-to-load)
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | var store1 = Ext.create( ‘Ext.data.Store‘ , { model: myModel, storeId: ‘store1‘ , //<-- adds this to Ext.data.StoreManager proxy: { type: ‘ajax‘ , url: ‘url...‘ , reader: ‘json‘ }, autoLoad: { callback: initData } }); var store2 = Ext.create( ‘Ext.data.Store‘ , { model: myModel, storeId: ‘store2‘ , proxy: { type: ‘ajax‘ , url: ‘url...‘ , reader: ‘json‘ }, autoLoad: { callback: initData } }); // Initialize store dependencies when all stores are loaded function initData() { var loaded; Ext.data.StoreManager.each( function(store) { loaded &= !store.isLoading(); return loaded; }); if (loaded) { // do stuff with the data } } |
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